Method and apparatus for controlling qubits with single flux quantum logic
a quantum logic and quantum logic technology, applied in the field of superconductor circuits, can solve the problem of dominated static power consumption in such circuits and achieve the effect of reducing the power consumption of static power consumption
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[0034]In FIG. 1 a superconducting circuit 10 is a single Josephson Junction 11 designated by symbol “X” and has a first and a second terminal Jx and Jy. The same notation is used to represent Josephson Junctions throughout the specification. A conventional Josephson Junction is comprised of two layers of superconductors separated by a very thin layer of a non-superconducting material, such as an insulator. When cooled to superconducting temperatures and biased with a DC current below a certain critical current Ie, the Josephson Junction conducts current without developing a voltage drop, i.e., without electrical resistance.
[0035]When an input voltage pulse, called a single flux quantum pulse (SFQ) derived from a previous superconducting circuit is applied, the inductor L1 converts the voltage pulse into sufficient bias current to attain the critical current. At this point the Josephson Junction triggers or “flips” and generates a single flux quantum output in response to the single ...
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